Today, S-21 Prison is known as the Tuol Sleng Museum of Genocide. Inside the gates, it looks like any high school; five buildings face a grass courtyard with pull-up bars, green lawns and lawn-bowling pitches. The ground-floor classrooms in one building have been left to appear as they were in 1977. The spartan interrogation rooms are furnished with only a school desk-and-chair set that faces a steel bed frame with shackles at each end. On the far wall are the grisly photographs of bloated, decomposing bodies chained to bed frames with pools of wet blood underneath. These were the sights that greeted the two Vietnamese photojournalists who first discovered S-21 in January of 1979. 20,000 Cambodians died in the camp only 170 ever got out alive.